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http://dx.doi.org/10.4191/KCERS.2004.41.12.889

Formation Mechanism of Aragonite by Substitute of Mg2+ Ions  

Choi, Kyung-Sun (Korea Institute of Geoscience and Mineral Resources)
Park, Jin-Koo (Korea Institute of Geoscience and Mineral Resources)
Ahn, Ji-Whan (Korea Institute of Geoscience and Mineral Resources)
Kim, Hwan (School of Materials Science and Engineering, Seoul National University)
Publication Information
Journal of the Korean Ceramic Society / v.41, no.12, 2004 , pp. 889-892 More about this Journal
Abstract
Acicular type aragonite precipitated calcium carbonate was synthesized by carbonation reaction of $Ca(OH)_2$ slurry and $CO_2$ gas. As increasing the initial concentration of $Mg^{2+}$ ion, calcite crystal phase substantially decreased while that of aragonite crystal phase increased. According to XRD and EDS analysis, it was found that the addition of $MgCl_2$ induced the $Mg^{2+}$ ion to substitute in $Ca^{2+}$ ion site of calcite lattice then the unstabled calcite structure be resolved, consequently the growth of calcite structure is interrupted while the growth of aragonite structure is expedited.
Keywords
Precipitated calcium carbonate; Aragonite; Carbonation process; Magnesium ion;
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